Solid-phase synthesis of a glycosylated hexapeptide of human sialophorin, using the trichloroacetimidate method
作者:Jörg Rademann、Richard R. Schmidt
DOI:10.1016/0008-6215(94)00364-l
日期:1995.4
acetyl-2-azid o-6- O-benzoyl-2-deoxy-D-galactopyranosyl trichloroacetimidates with Fmoc-protected pentafluorophenyl esters of L-serine and L-threonine in the presence of trimethylsilyl trifluoromethanesulfonate as Lewis acid. The glycosylated pentafluorophenyl ester of L-threonine was transformed into glycopeptides via a solid-phase synthesis. Azide reduction and N-acetylation were performed on the
使用基于Fmoc的糖基化五氟苯基酯合成了包含β-D-Galp-(1-> 3)-alpha-D-Gal pNAc-(1-> O)-L-苏氨酸单元的六肽。在所有糖基化反应中,成功地使用了三氯乙酰亚胺酸酯。由四-O-乙酰基-α-D-吡喃半乳糖基三氯乙酰亚胺酸酯和叔丁基二甲基甲硅烷基2-叠氮基-6-O-苯甲酰基-2-脱氧-β-E-吡喃半乳糖苷以二氟化硼醚化物为催化剂制备二糖部分。糖基化的活性酯是通过α和β2,3,4,6-四-O-乙酰基-β-D-吡喃半乳糖基-(1-> 3)在三甲基甲硅烷基三氟甲磺酸酯的存在下,将L-丝氨酸和L-苏氨酸的Fmoc保护的五氟苯基酯与4-O-乙酰基-2-叠氮基o-6-O-苯甲酰基-2-脱氧-D-吡喃半乳糖基三氯乙酰亚氨酸酯酸。L-苏氨酸的糖基化五氟苯基酯通过固相合成转化为糖肽。用硫代乙酸-吡啶混合物在固相上进行叠氮化物还原和N-乙酰化。然后用强酸从树脂上切割糖肽,同时也除